Technical description and composition of the LG 42LS562T TV, panel type and applicable modules. The composition of the modules.LG LED
Model: 42LS562T ZD
Chassis / Version: LD21B / LC21B
Panel: T420HVN01.1
LED backlight: 74.42T23.001-2-DS1
T-CON: 31T14-C0J T315HW07 VB CTRL BD
LED driver (backlight): 4H + V3416.001 V341-001
Power Supply (PSU): EAX64427001 (1.4) EAY62608801 PSLF-L116A LGP42L-12P
PWM Power: FAN7930BMX (PFC), ICE3BR4765JZ (Standby DIP-7), L6599AD
MOSFET Power: STD10NM60N (PFC), STD7NM60N
MainBoard: EAX64317404 1.0 EBR75149828
IC MainBoard: LGE2111A-T8, H27U1G8F2BTR, W25Q80B, AT24C256C, STA3808WE
Tuner: TDSS-G101D
Control: IR: EBR74966702 1BF-3010B LM35-55 Ver 2.2
Specifications 42LS562T
LG 42LS562T
General repair guidelines for TV LCD LED
Possible manifestations of defects
- LG 42LS562T TV does not turn on at all. There is no reaction to the remote control and control buttons from the front panel. Indicator lights do not light or flash.
Failure in such cases should begin to be sought in the power supply circuits of the EAX64427001. It is necessary to measure its output voltages and, if they are absent, check the power switches (STD10NM60N (PFC), STD7NM60N) and rectifier diodes for the probability of short circuit in the converters.
In case of breakdowns of semiconductors in the secondary circuits of any converter, as a rule, it can operate in emergency short-circuit mode without output voltages, and during short circuit in the elements of the primary circuit, the main fuse and, less often, the current sensor at the source of the key are most often cut off.
Mos-Fet power switches, used in switching power supplies, sometimes fail due to a malfunction of any other elements that can put it out of operation in key mode, or create an excess of the maximum permissible parameters of the switch. These can be elements supplying the PWM controller, frequency-setting or damping circuits, or negative feedback elements in the stabilization circuit. PWM controllers FAN7930BMX (PFC), ICE3BR4765JZ (Standby DIP-7), L6599AD, in the absence of visible damage or explicit short-circuit between the terminals, are checked by replacing with new ones, or obviously working.
- There is no image, but there is sound and reaction to commands from the remote control. Or the image appears immediately after turning on and disappears.
In most of these cases, a malfunction is detected in the nodes and backlight elements of the LED panel. The reason can be both in the power of the LEDs, in their serviceability (breakdown or breakage), as well as in the violation of the contact connections of the LED strips.
To detect a break in the LED lines without disassembling the panel, a current source is required. It is impossible to open transitions connected in series with a simple multimeter; voltage of several tens of volts is necessary.
- The indicator blinks or lights constantly, the TV does not turn on, does not respond to the remote control.
Repair or diagnostics of the EAX64317404 motherboard should begin by checking the stabilizers and power converters needed to power the chips and matrix. If necessary, update or replace the software (software). In some cases, to repair the MB (SSB) board, it may be necessary to replace the chips - LGE2111A-T8, H27U1G8F2BTR, W25Q80B, AT24C256C, STA3808WE with new or obviously working ones. In cases where BGA technologies are used, defects are usually localized by the heating method.
Before replacing the TDSS-G101D tuner, if there is no tuning for the channels, you must first check the software and the supply voltage at its terminals. It is also necessary to make sure that the tuner and processor can exchange data via the I2C bus
Owners and users of the LG 42LS562T TV should remember that self-repair without special knowledge, skills and qualifications can be fraught with negative consequences that can lead to complete non-repairability of the device!
The appearance of the MainBoard EAX64317404 is shown in the figure below:EAX64317404
EAX64317404 can be used in TVs:
LG 32LS560T (Panel LC320EUN (SE)(M2)), LG 42LS5600 (Panel T420HVN01.1), LG 47LM580T (Panel LC470EUE (SE)(U1)), LG 42LM3400 (Panel LC420DUN (SE)(U2)), LG 37LS560T (Panel LC370EUN (SE)(M2)), LG 32LM340T (Panel LC320DXN (SE)(U3)), LG 47LM615S (Panel LC470EUE (SE)(U1)), LG 32LM3400 32LM3400-ZA (Panel LC320DXN (SE)(U2)).
The appearance of the power supply
Main features of the device LG 42LS562T:
The matrix (LED panel) T420HVN01.1 is installed.
The matrix control uses the Timing Controller (T-CON) 31T14-C0J.
The LED driver 4H + V3416.001 is used to power the backlight LEDs.
The necessary supply voltages for all nodes of the LG 42LS562T TV are generated by the EAX64427001 power module or its analogs using FAN7930BMX (PFC), ICE3BR4765JZ (Standby DIP-7), L6599AD microcircuits and power switches of the STD10NM60N (PFC), STD7NM60N type.
MainBoard - the main board (motherboard) is an EAX64317404 module, using chips LGE2111A-T8, H27U1G8F2BTR, W25Q80B, AT24C256C, STA3808WE and others.
The TDSS-G101D tuner provides TV reception and channel tuning.
Additional technical information about the panel:
Brand: AUO
Model: T420HVN01.1 CELL
Type: a-Si TFT-LCD, CELL
Diagonal size: 42 inch
Resolution: 1920x1080, FHD
Display Mode: AMVA3, Normally Black
Active Area: 930.24x523.26 mm
Surface: Antiglare (Haze 2%), Hard coating (3H)
Glass Depth: 0.50 + 0.50 mm
Transmissivity: 5.7% (with Polarizer)
Contrast Ratio: 3000
Display Colors: 16.7M (8-bit), CIE1931 72%
Response Time: 6.5 (G to G)
Frequency: 60Hz
Signal Interface: LVDS (2 ch, 8-bit), 51 pins
Voltage: 12.0V